GB263493A - Improvements in or relating to reversing gearing - Google Patents

Abstract

263,493. Matteucci, R. Dec 21, 1925, [Convention date]. Reversing-gearing suitable for ship propulsion comprises a frictional epicyclic train 4, 8, 9, Figs. 1 and 2, and an expanding device which proportions the adhesion automatically to the load. A driving-shaft 1 carries a cone friction clutch member 2 and a hub 3, which is connected through the expanding device 7 &c. to the sun gear track 4. The annular track 9 is connected through a web 10<1> to a driven shaft 10. The planet rollers 8 are spaced apart and carried bodily by a cage 11 which has a splined connection 12 with a web 13 secured to a double friction cone 14. A spring 16 normally holds the cone 14 in engagement with the cone 2 so that the cage 11 turns with the track 4. The rollers 8 can slip very little if at all, and drive the annulus 9 and shaft 10 substantially solid with the shaft 1. When a lever 19 is moved from position A to position O, the spring 16 is compressed and the clutch 14 is freed, disengaging the drive. Further movement of the lever 19 to position R brings the double cone 14 into engagement with an adjustable non-rotary brake ring 24. The cage 11 is held against rotation, and the annulus 9 and shaft 10 are driven reversely at reduced speed. A modification is described in which the brake ring is the innermost of the nested friction cones and is supported on a fixed gear casing. The automatic expanding-device for the track 4 comprises centering rollers 5, Fig. 2, and resilient rollers 6, to produce initial grip, as described in Specification 227,768, [Class 80 (i), Gearing, Belt &c.]. A plate or lever 7 extends from a notch in the hub 3 between the abutting ends of the split track 4, and serves to prise these ends apart and so expand the track against the transmitting rollers 8. The lever 19 may be operated by a rod 31, Fig. 4, which is normally held with its pivot P in position 4 by the clutch spring 16. When fluid is admitted to a cylinder 35, a pistonrod 33 rises, bringing the pivot P to position O. When fluid is admitted also to a cylinder 35<1> by a suitable valve, a piston-rod 33<1> rises, bringing the pivot P to the second definite gear position R.